package com.itheima.reggie.config;

import com.itheima.reggie.mapper.JacksonObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

@Slf4j
@Configuration

public class WebMvcConfig extends WebMvcConfigurationSupport {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");

    }

    @Override    //mvc框架消息转换器  -解决精度丢失问题
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("消息转换器转换");
        //创建消息转换器
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();

        //设置对象转化器  将java对象转换成json数据
        messageConverter.setObjectMapper(new JacksonObjectMapper());

        //将消息转换器对象放入mvc框架集合里
        converters.add(0,messageConverter);
    }
}
